在德克萨斯州一座偏远山峰的内部，人们正在组装一座巨型的时钟。这座钟可以在未来的一万年内计时。

INSIDE a remote mountain in Texas, a gargantuan clock is being pieced together, capable of telling the time for the next 10,000 years.

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开始计时，并试着在半个小时内做出晚餐。

Begin keeping track of the time, and try to make dinner last at 30 minutes.

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因此，在每个小时中，我们可以希望在 10 分钟内每一分钟触发一次计时器事件，而接下来的 50 分钟内不触发事件。

So, for example, suppose once an hour we want to get timer events every minute for 10 minutes, and then 50 minutes where no timer events occur.

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We're also posting a practice exam for you to take, so after you're completely done your studying, it's good to have everything done before you take the practice exam, and then sit down just with this sheet here and your calculator, and ideally a timer, and make sure you can do the practice exam in the allotted amount of time.

我们还将给出一份模拟试题，因此在你完全复习好之后，最好先复习完,再做这份模拟试题，坐下来,只拿出这张表与计算器，最好还有个计时器，确保自己完成模拟题,在规定的时间内。

麻省理工公开课 - 化学原理课程节选